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Hi all
700c / Schwalbe G-one alround tubless tyre.
I pinch-flatted on a tubeless set up on the gravel bike last week when in the Highlands, it burped, resealed at about 20-30psi (waaay too low for the 35mm tyre width) and trailside I couldn't get the tyre to 100% seat / seal even sloshing the sealant around (was leaking air when at full pressure from 1 spot on the tyre/ rim interface; ended up sticking a tube in to continue).
I've come to re-set as tubeless again now home. But still down the same thing repeatedly- slow leak from 1 spot ay 60psi..sealant shwooshed around seals it for a couple of minutes... then goes again.
Anyway- if I pinch the tyre bead between my finger and thumb then run them around the bead, the bead seems to have multiple 'soft' spots where its more flexi / easily kinks
, than other points. It's as though the beading is broken in 10 or 15 places around the circumference. It's a folding tyre, not wire bead though. And the leak is at one of these points where the bead folds more easily.
I've never noticed this (either way so dont know what's normal) on tyres before - and have 3 bikes set up tubeless and have had the MRB tubeless for years and years and use folding tyres on several bikes.
Is this normal ? Or is indeed the beading cord broken in loads of places ? I've no brand new tyre to compare to.
The tyre is about 14 months old, low mileage (maybe 1000 to 1200 miles total) and no other problems since new (it's the original tyre on the bike which was akready fully set up tubeless when delivered).
The rim and tape looks absolutely fine - no marks or dings at all.
Is the beading broken and I need a
New tyre ? Or is this usual ?
Is the beading broken...
I doubt very much that you've broken a folding bead, probably just feels different where it was folded in the factory
Mark the leaky spot and move the tyre around the rim (if you can stand not lining the logo up 🙂 ) and see if it still leaks from that point on either the tyre or the rim
Sounds like the rim might be damaged. Or you have damaged the rim strip?
I had similar on the same tyre. The sidewall was abraded a few mm up from the rim. It did eventually seal up again after many repeated sealant sloshing attempts, thought it was knackered but it is ok now.
Thanks for the replies.
I tried to reposition the tyre to a different point on the rim - the same problem still happened, so me thinks the tyre is the problem.
(Logos at 90 degrees so still looks OK 😁).
The rim seems fine - I marked the position and it doesn't seem to have any damage. Rim tape also looks fine in that spot. And I've got another old tyre to seal up OK on it now.
I'll get my best reading glasses o and look at the bead area of the tyre more closely, Robola 👍 (I did mark the tyre too where it was leaking).
I'll order a new tyre too to be able to compare, once it gets here.
Hmmm, sounds like to have isolated the tyre as the issue then.
Sidewalls leaks are a weak spot for the sealant, you could try a patch on the inside of the tyre where it is leaking, that may well sort it.
Good idea.
I've looked at the spot closely now and there's just a bit of a scuff on the outer where its leaking. About 2mm above the actual bead - so lines up exactly wirh the edge of the rim.so that will be where the pinch happened. Its not through the sidewall - but maybe enough rubber thinned to stop the sealing up properly when at Full pressure (about 55-60psi for me when the bike is loaded, as I'm no 9 stone waif).
I'll try clean it up and get a patch on it and give it another try later in the week - if it works then it'll become a spare tyre.
(1st problem I've had with tubeless - the mtb has been tubeless for probably 10 years now, the road bike for 2+, and this gravel bike for about 15 months. I sort of regret not going to a bigger tyre for the trip on the front as well as the rear, as that may have been just enough to not have blown).
Yeah, mine was just the same, it wasn’t really a hole just thinned enough to leak. The sidewalls must be very thin as I had sealant oozing through them for a while when new (they are definitely tubeless rated).
I took the wheel off and left the wheel horizontal to let the sealant sit on the abraded area, I didn’t need to patch it.
I've never had as much trou ke with any tyre as my Schwalbe G One all rounds. Could never get them to work well tubeless and just punctured with one this morning so binned it and fitted a cheapie decathlon tyre which was far better in the end
I’ve come to re-set as tubeless again now home. But still down the same thing repeatedly- slow leak from 1 spot ay 60psi..sealant shwooshed around seals it for a couple of minutes… then goes again.
Has the bead popped? There's usually a line you can follow, does it have an equal space all around or is a small part trapped and letting air out?
If not, spray it with soapy water both sides, pump up until it goes pop, then deflate to 60 psi.